Electric toothbrush head and electric toothbrush

Abstract

This invention relates to an electric toothbrush head and an electric toothbrush. The brush head includes a connector and an elastic member. The connector is detachably installed within the brush head body and has an insertion hole. The elastic member is installed on the outer surface of the connector and includes a connecting portion and two clamping portions. The connecting portion is located at the top of the connector. The ends of the clamping portions adjacent to the connecting portion and the ends away from the connecting portion are respectively clamped between the connector and the brush head body, thereby generating a rebound force in the middle of the clamping portion. The connector has a through hole at the position corresponding to the middle of the clamping portion. The middle of the clamping portion is relatively bent to form an abutment bow that can elastically deform radially along the insertion hole. When the drive shaft is inserted into the insertion hole of the connector, the two abutment bows pass through the through hole and directly press against the opposite sides of the drive shaft. In the unloaded state, the distance between the apexes of the abutment bows is less than the radial thickness of the drive shaft of the electric toothbrush. The above-described electric toothbrush head has a simple structure and can ensure the stability of the connection between the brush head and the drive shaft.

Description

Technical Field

[0001] This invention relates to the field of toothbrush technology, and more particularly to an electric toothbrush head and an electric toothbrush. Background Technology

[0002] As living standards improve, people are paying more and more attention to oral health. Electric toothbrushes are becoming increasingly popular due to their strong cleaning ability, ease of use, and ability to reduce damage to teeth and gums.

[0003] Electric toothbrushes typically include a handle and replaceable brush heads. One end of the handle protrudes from a drive shaft, and the handle contains a drive mechanism that allows the drive shaft to rotate / vibrate. The drive shaft is inserted into the brush head, and the torque of the drive shaft can be transmitted to the brush head through the connection structure between the drive shaft and the brush head.

[0004] Therefore, the connection structure between the brush head and the drive shaft is crucial for the stability of the connection between them. Currently, the connection structures between electric toothbrush heads and handles vary, with some being quite complex and involving many parts, resulting in higher production costs. Summary of the Invention

[0005] In view of this, the technical problem to be solved by the embodiments of the present invention is to provide an electric toothbrush head and an electric toothbrush with a simple structure that can ensure the stability of the connection between the brush head and the drive shaft.

[0006] To address the aforementioned technical problems, this invention provides an electric toothbrush head, comprising a hollow brush head body and bristles located at one end of the brush head body; the brush head further includes a connecting member and an elastic member located inside the brush head body; the connecting member is detachably mounted within the brush head body, and the connecting member has an insertion hole for mounting a drive shaft of the electric toothbrush; the elastic member is mounted on the outer surface of the connecting member, and the elastic member includes a connecting portion and two clamping portions formed by bending and extending from opposite sides of the connecting portion, the connecting portion being located at the top of the connecting member, and the clamping portions being adjacent to... The ends of the connecting portion and the ends away from the connecting portion are respectively clamped between the connecting member and the brush head body, thereby generating a rebound force in the middle of the clamping portion; the connecting member is provided with a through hole at the position corresponding to the middle of the clamping portion, and the middle of the clamping portion is relatively bent to form an abutment bow that can elastically deform along the insertion hole; when the drive shaft is inserted into the insertion hole of the connecting member, the two abutment bows pass through the through hole and directly press against the opposite sides of the drive shaft; when the abutment bows are not under force, the distance between their apexes is less than the radial thickness of the drive shaft of the electric toothbrush.

[0007] Furthermore, each of the two clamping parts has a free end on the side away from the connecting part, and the free ends bend and extend to form a limiting hook. The connecting part is provided with a corresponding relief groove, and the limiting hook can slide up and down along the axial direction of the insertion hole and is located in the relief groove.

[0008] Furthermore, the connector has two limiting blocks spaced vertically along the axial direction of the insertion hole at one end near the bristles, and the through hole is located between the limiting blocks; the connecting part is clamped between the top of the limiting block near the bristles and the inner wall of the brush head body, the two clamping parts are located on opposite sides of the limiting block, the position of the abutment bow corresponds to the through hole, and the abutment bow bends into the through hole; each limiting block has two limiting parts symmetrically arranged left and right along the axial direction of the insertion hole, the insertion hole extends from one end of the connector into the limiting block near the bristles, and the clamping parts abut against the two mutually symmetrical limiting parts respectively.

[0009] Furthermore, the portions of each limiting part adjacent to both ends of the abutment bow are all inclined surfaces, and the two ends of the abutment bow rest against the corresponding inclined surfaces.

[0010] Furthermore, the outer surface of the connector is provided with a recessed mounting groove corresponding to the location where the elastic element is installed, wherein the depth of the mounting groove corresponding to the clamping part is less than the thickness of the clamping part.

[0011] Furthermore, the thickness of the clamping part protruding from the surface of the connecting member is between 0.01 mm and 0.3 mm.

[0012] Furthermore, the gap between the surface of the connecting member corresponding to the two clamping parts and the inner wall surface of the brush head body is 1mm to 1.8mm.

[0013] Furthermore, on the outer side walls of the connector on opposite sides, one side is a plane and the other side is an arc surface.

[0014] Furthermore, the apex positions of the two clamping parts are symmetrical about the central axis of the socket, and the shapes of the two clamping parts are either symmetrical or asymmetrical about the central axis of the socket.

[0015] Furthermore, with the central axis of the insertion hole as the axis, the shapes of the two clamping parts are asymmetrical. The top of the contact bow of one clamping part is a flat surface, and the flat surface is provided with several grooves. The top of the contact bow of the other clamping part is an arc surface.

[0016] Furthermore, the outer surface of the elastic element has a coating for noise reduction and improved wear resistance.

[0017] This invention also provides an electric toothbrush, including a handle and the aforementioned electric toothbrush head. One end of the handle protrudes from a drive shaft, which is inserted from one end of the connector and passes through the gap between the two limiting blocks. The two abutting bows of the elastic member undergo elastic deformation to clamp the drive shaft.

[0018] Furthermore, the gap between the drive shaft and the inner wall of the limiting block insertion hole is 0.02mm.

[0019] Compared with existing technologies, in this embodiment of the invention, since the distance between the apexes of the two abutment bows is less than the radial thickness of the drive shaft when no force is applied, after assembling the electric toothbrush handle and brush head, the drive shaft applies an outward expansion force to the clamping part, causing the abutment bows to deform. The inner wall of the brush head body forces the abutment bows to spring back, thereby allowing the two clamping parts to tightly clamp the drive shaft from both sides. The above-mentioned brush head structure is simple, and the drive shaft is clamped by elastic elements, thus ensuring the stability of the connection between the brush head and the drive shaft. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings.

[0021] Figure 1 This is a schematic diagram of a preferred embodiment of the electric toothbrush of the present invention.

[0022] Figure 2 yes Figure 1 A three-dimensional exploded view of the medium brush head.

[0023] Figure 3 yes Figure 2 A three-dimensional schematic diagram of the connecting component.

[0024] Figure 4 yes Figure 2 A three-dimensional schematic diagram of the elastic element.

[0025] Figure 5 yes Figure 2 Axial sectional view of the central connecting member and the elastic member after assembly.

[0026] Figure 6 yes Figure 1 A three-dimensional schematic diagram of the central drive shaft.

[0027] Figure 7 yes Figure 1 The illustrated embodiment shows an axial cross-sectional view of the brush head and drive shaft after assembly. Detailed Implementation

[0028] To enable those skilled in the art to better understand the technical solutions in the embodiments of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art should fall within the protection scope of the present invention.

[0029] Please see Figure 1 and Figure 2 This is a preferred embodiment of the electric toothbrush of the present invention. The electric toothbrush includes a handle 1 and a replaceable brush head 2. One end of the handle 1 protrudes from the drive shaft 11, and the drive shaft 11 can be inserted into the brush head 2.

[0030] The brush head 2 includes a hollow brush head body 21, bristles 22, a connector 23, an elastic element 24, and a decorative ring 25. The bristles 22 are located at one end of the brush head body 21. The connector 23 is detachably installed inside the brush head body 21. The elastic element 24 is installed on the outer surface of the connector 23. The decorative ring 25 is located at the end of the brush head body 21 near the handle 1. Its color is different from that of the handle 1 and the brush head body 21 to identify the brush head 2.

[0031] Please refer to the following: Figures 3 to 7 The brush head body 21, at the end away from the bristles 22, has an internal mounting hole 211 that matches the shape of the connector 23, and the connector 23 is installed in the mounting hole 211. The connector 23 has an insertion hole 231 for mounting the drive shaft 11. The elastic member 24 is integrally bent from a metal sheet and includes a connecting portion 241 and two clamping portions 242, which are respectively bent and extended from opposite sides of the connecting portion 241. The connecting portion 241 is located at the top of the connector 23. The ends 2421 of the clamping portions 242 adjacent to the connecting portion 241 and the ends 2422 away from the connecting portion 241 are respectively clamped between the connector 23 and the brush head body 21, thereby generating a rebound force in the middle of the clamping portion 242. The connector 23 has a through hole 232 at the middle of the corresponding clamping part 242. The middle of the clamping part 242 is bent to form an abutment bow 2423 that can elastically deform radially along the insertion hole 231. When the drive shaft 11 is inserted into the insertion hole 231 of the connector 23, the two abutment bows 2423 pass through the through hole 232 and directly press against the opposite sides of the drive shaft 11. When the abutment bows 2423 are not under force, the distance between the apexes of the two abutment bows 2423 is less than the radial thickness of the drive shaft 11.

[0032] When the brush head 2 is assembled with the handle 1, the drive shaft 11 is inserted into the insertion hole 231 and applies an outward expansion force to the two abutment bows 2423 of the elastic member 24, causing the abutment bows 2423 to deform. Since the two ends 2421, 2422 of the clamping part 242 are clamped between the connecting member 23 and the brush head body 21, the abutment bows 2423 are forced to rebound, thereby allowing the two clamping parts 242 to firmly clamp the drive shaft 11 from both sides. When the electric toothbrush is in use, the drive shaft 11 is clamped by the elastic member 24, thereby being firmly assembled with the connecting member 23. The drive shaft 11 drives the bristles 22 to rotate / vibrate to complete the cleaning.

[0033] Specifically, the portion where the connecting member 23 mates with the elastic member 24 is approximately conical, and the two clamping portions 242 are inclined outwards. In this embodiment, the outward inclination angle of each clamping portion 242 is 4°. Each of the two clamping portions 242 has a free end on the side away from the connecting portion 241, and the free ends are bent and extend into limiting hooks 2424. The connecting member 23 is provided with a corresponding relief groove 233, and the limiting hooks 2424 are slidably located in the relief groove 233. When the abutment bow 2423 undergoes elastic deformation, since the clamping portion 242 is limited by the space between the inner wall of the brush head body 21 and the connecting member 23 in the radial direction of the drive shaft 11, the limiting hooks 2424 will slide up and down along the axial direction of the insertion hole 231 in the relief groove 233.

[0034] Two limiting blocks 234 are provided on the end of the connector 23 near the bristles 22, spaced apart axially along the insertion hole 231. A through hole 232 is located between the limiting blocks 234. The connecting part 241 is clamped between the top of the limiting block 234 near the bristles 22 and the inner wall of the brush head body 21. Two clamping parts 242 are located on opposite sides of the limiting block 234, and the position of the abutment bow 2423 corresponds to the through hole 232. The abutment bow 2423 bends into the through hole 232. Each limiting block 234 has two limiting parts 2341 symmetrically arranged axially along the insertion hole 231. The insertion hole 231 extends from one end of the connector 23 into the limiting block 234 near the bristles 22. The two clamping parts 242 abut against the two symmetrical limiting parts 2341 to ensure that the force on both sides of the drive shaft 11 is balanced.

[0035] When the brush head 2 is assembled with the handle 1, the drive shaft 11 is inserted into the insertion hole 231 at the bottom of one end of the connector 23, passes through one of the limiting blocks 234, and then inserts into another limiting block 234 near the bristles 22. Since the two limiting blocks 234 are arranged vertically and horizontally in the axial direction of the insertion hole 231, the stability of the drive shaft 11 installation can be further enhanced, preventing the drive shaft 11 from swinging abnormally in the radial direction. The gap between the drive shaft 11 and the inner wall of the insertion hole 231 of the limiting block 234 is preferably 0.02 mm. If the gap is too large, the drive shaft 11 will swing in the insertion hole 231.

[0036] Furthermore, the outer surface of the connector 23 has a recessed mounting groove 235 corresponding to the mounting location of the elastic member 24. The depth of the mounting groove 235 corresponding to the clamping part 242 is less than the thickness of the clamping part 242, so that after the connector 23 is installed to the brush head body 21, the inner wall surface of the brush head body 21 can clamp the two clamping parts 242 of the elastic member 24, thereby providing a rebound force to the two abutting bows 2423. In this embodiment, the thickness of the surface 2425 of the clamping part 242 protruding from the surface of the connector 23 is between 0.01mm and 0.3mm. In addition, the gap between the surface of the connector 23 corresponding to the two clamping parts 242 and the inner wall surface of the brush head body 21 is 1mm to 1.8mm. If the gap is too small, the drive shaft 11 cannot be inserted into the insertion hole 231; if the gap is too large, the rebound force provided by the inner wall surface of the brush head body 21 is insufficient, and the clamping is unstable. In this embodiment, the gap between the surface of the two clamping parts 242 of the connector 23 and the inner wall of the brush head body 11 is 1.3mm.

[0037] On the outer side walls of the connector 23 on both sides, one side is a flat surface 236 and the other side is an arc surface. This asymmetrical structural design can prevent misalignment when the connector 23 is assembled with the brush head body 11.

[0038] In order to ensure that the elastic element 24 and the connecting element 23 are properly assembled, the portion of each limiting part 2341 adjacent to the two ends of the two abutting bows 2423 is a slope 2342. The two ends of the two abutting bows 2423 are attached to the corresponding slope 2342, so that the abutting bows 2423 can be well supported and prevent the two ends of the abutting bows 2423 from being suspended.

[0039] like Figure 4As shown, the apex positions of the two clamping portions 242 are symmetrical about the central axis of the insertion hole 231. The shapes of the two clamping portions 242 can be symmetrical or asymmetrical about the central axis of the insertion hole 231. In this embodiment, the shapes of the two clamping portions 242 are asymmetrical about the central axis of the insertion hole 231. The top end of the contact bow 2423 of one clamping portion 242 is flat to increase the contact area between the clamping portion 242 and the drive shaft 11, while the top end of the contact bow 2423 of the other clamping portion 242 is curved. The top flat surface of the contact bow 2423 is further provided with several parallel grooves 2426, thereby forming several concave and convex structures on the contact bow 2423. Correspondingly, as shown... Figure 6 As shown, the surface of the drive shaft 11 that contacts the plane of the contact bow 2423 is also a plane 111. This plane 111 also has several similar concave-convex structures 112. Through the cooperation between the contact bow 2423 and the concave-convex structures on the drive shaft 11, the tightness of the contact between the drive shaft 11 and the elastic member 24 can be enhanced, improving the anti-slip effect. It is understood that the shape of the two clamping parts in this embodiment is not limited to the above-described form; it can also be other forms. For example, the top ends of the contact bows of both clamping parts can be flat or curved. Furthermore, the form on the top plane of the contact bow in this embodiment is not limited to the above-described groove form, as long as the plane can meet the roughness requirements and increase the friction. In addition, the outer surface of the elastic member 24 has a coating for noise reduction and improved wear resistance; the coating can be made of rubber oil.

[0040] In the above embodiment, since the distance between the apexes of the two abutment bows 2423 is less than the radial thickness of the drive shaft 11 when the handle 1 and brush head 2 are not under force (i.e., when the handle 1 and brush head 2 are not assembled), after assembly, the drive shaft 11 applies an outward expansion force to the clamping part 242, causing the abutment bows 2423 to deform. The inner wall surface of the brush head body 21 forces the abutment bows 2423 to rebound, thereby allowing the two clamping parts 242 to tightly clamp the drive shaft 11 from both sides. The brush head 2 has a simple structure, and the stability of the connection between the brush head 2 and the drive shaft 11 can be ensured by clamping the drive shaft 11 with the elastic element 24.

[0041] The above embodiments are merely preferred embodiments of the present invention, but the embodiments of the present invention are not limited to the above embodiments. Any changes, modifications, substitutions, combinations, or simplifications made without departing from the spirit and principle of the present invention should be considered as equivalent substitutions and are included within the protection scope of the present invention.

Claims

1. An electric toothbrush head, comprising a hollow brush head body and bristles located at one end of the brush head body; characterized in that, The brush head also includes a connector and an elastic element located inside the brush head body; the connector is detachably installed in the brush head body, and the connector has an insertion hole for mounting the drive shaft of the electric toothbrush; the elastic element is installed on the outer surface of the connector, and the elastic element includes a connecting portion and two clamping portions formed by bending and extending from opposite sides of the connecting portion. The connecting portion is located at the top of the connector, and the ends of the clamping portions adjacent to the connecting portion and the ends away from the connecting portion are respectively clamped between the connector and the brush head body, thereby generating a rebound force in the middle of the clamping portion; the connector has two limiting blocks arranged vertically and vertically along the axial direction of the insertion hole at one end near the bristles, and the connector has a through hole at a position corresponding to the middle of the clamping portion, the through hole being located between the limiting blocks; The connecting part is clamped between the top of the limiting block near the bristles and the inner wall of the brush head body. The two clamping parts are located on opposite sides of the limiting block. Each limiting block has two limiting parts symmetrically arranged along the axial direction of the insertion hole. The clamping parts abut against the two limiting parts respectively. The middle part of the clamping part is bent relative to each other to form an abutment bow that can elastically deform along the radial direction of the insertion hole. The position of the abutment bow corresponds to the through hole. The abutment bow bends into the through hole. The insertion hole extends from one end of the connecting member into the limiting block near the bristles. When the drive shaft is inserted into the insertion hole of the connecting member, the abutment bows on the two clamping parts pass through the through hole and directly abut against the opposite sides of the drive shaft. When the abutment bow is not under force, the distance between its apexes is less than the radial thickness of the drive shaft of the electric toothbrush.

2. The electric toothbrush head as described in claim 1, characterized in that, The two clamping parts each have a free end on the side away from the connecting part. The free ends are bent and extend into limiting hooks. The connecting part is provided with a corresponding relief groove. The limiting hook can slide up and down along the axial direction of the insertion hole and is located in the relief groove.

3. The electric toothbrush head as described in claim 1, characterized in that, The portions of each limiting part adjacent to both ends of the abutment bow are all inclined surfaces, and the two ends of the abutment bow on the two clamping parts abut against the corresponding inclined surfaces.

4. The electric toothbrush head as described in claim 1, characterized in that, The outer surface of the connector is provided with a recessed mounting groove corresponding to the location where the elastic element is installed, wherein the depth of the mounting groove corresponding to the clamping part is less than the thickness of the clamping part.

5. The electric toothbrush head as described in claim 4, characterized in that, The thickness of the clamping part protruding from the surface of the connector is between 0.01 mm and 0.3 mm.

6. The electric toothbrush head as described in claim 1, characterized in that, The gap between the surface of the connector corresponding to the two clamping parts and the inner wall of the brush head body is 1mm to 1.8mm.

7. The electric toothbrush head as described in claim 1, characterized in that, On the outer side walls of the connector on opposite sides, one side is a plane and the other side is an arc surface.

8. The electric toothbrush head as described in claim 1, characterized in that, The apex positions of the two clamping parts are symmetrical about the central axis of the socket, and the shapes of the two clamping parts are either symmetrical or asymmetrical about the central axis of the socket.

9. The electric toothbrush head as described in claim 8, characterized in that, With the central axis of the insertion hole as the axis, the two clamping parts are asymmetrical in shape. The top of the contact bow of one clamping part is a flat surface with several grooves on the flat surface, while the top of the contact bow of the other clamping part is an arc surface.

10. The electric toothbrush head as described in claim 1, characterized in that, The outer surface of the elastic element has a coating for noise reduction and improved wear resistance.

11. An electric toothbrush, comprising a handle, one end of which protrudes from a drive shaft, characterized in that, The electric toothbrush further includes an electric toothbrush head as described in any one of claims 1 to 10, wherein the drive shaft is inserted from one end of the connector, passes through the gap between the two limiting blocks, and the two abutting bows of the elastic member undergo elastic deformation to clamp the drive shaft.

12. The electric toothbrush as described in claim 11, characterized in that, The gap between the drive shaft and the inner wall of the limiting block insertion hole is 0.02mm.

Images